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TLC1541IDW 데이터시트(PDF) 8 Page - Texas Instruments

부품명 TLC1541IDW
상세설명  10-BIT ANALOG-TO-DIGITAL CONVERTER WITH SERIAL CONTROL AND 11 INPUTS
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TLC1541
10-BIT ANALOG-TO-DIGITAL CONVERTER
WITH SERIAL CONTROL AND 11 INPUTS
SLAS073C – DECEMBER 1995 – REVISED AUGUST 1996
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 2, the time required to charge the analog input capacitance from 0 V to
VS within 1/2 LSB can be derived as follows:
The capacitance charging voltage is given by
VC = VS 1–e
–tc/RtCi
(
)
(1)
where
Rt = Rs + ri
The final voltage to 1/2 LSB is given by
(2)
VC (1/2 LSB) = VS – (VS/2048)
Equating equation 1 to equation 2 and solving for time (tc) gives
VS –(VS/2048) = VS 1–e
(
)
(3)
–tc/RtCi
and
tc (1/2 LSB) = Rt × Ci × ln(2048)
(4)
Therefore, with the values given, the time for the analog input signal to settle is
(5)
tc (1/2 LSB) = (Rs + 1 kΩ) × 55 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams.
VI = Input Voltage at INPUT A0 – A10
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Input Capacitance
† Driving source requirements:
• Noise and distortion levels for the source must be at least
equivalent to the resolution of the converter.
• Rs must be real at the input frequency.
Rs
ri
VS
VC
55 pF MAX
1 k
Ω MAX
Driving Source†
TLC1541
Ci
VI
Figure 2. Equivalent Input Circuit Including the Driving Source


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